论文部分内容阅读
基于金属屈服型阻尼器和以双线性滞回模型表示的主体结构侧向变形骨架曲线,提出了一种用于结构减震控制的直接基于位移的弹塑性设计方法。建立了单自由度减震系统稳态响应下的等价阻尼比和等价刚度的计算式,推导了平均阻尼比的显式表达式,并将平均阻尼比作为地震作用下减震结构滞回耗能的等价阻尼比。考虑阻尼器不仅向结构系统提供附加阻尼还提供附加刚度,提出了减震结构在目标位移下的等价刚度与层剪力成比例的分配条件,以实现目标位移下结构刚度的分布优化。为考虑高阶振型的影响,提出对基于1阶振型的设计结果的修正方法。采用层剪切模型,对28种具有不同弹性刚度、2次刚度比和屈服位移角分布形式的结构进行减震设计,对非控制结构和控制结构实施了共计336种工况的弹塑性时程分析。结果表明,控制结构的层间位移角较好地控制在目标位移角以内,且各层位移角均匀分布,基本达到预期的变形目标。同时,控制结构的残余变形角更小,离散程度也更小。所提方法可有效地应用于结构的减震控制设计。
Based on the metal yielding damper and the lateral deformation skeleton curve of the main structure, which is represented by the bilinear hysteresis model, a direct displacement-based elastic-plastic design method for damping control of structures is proposed. The equivalent damping ratio and the equivalent stiffness formula under single-degree-of-freedom damping system are established. The explicit expression of the average damping ratio is deduced. The average damping ratio is taken as the hysteresis of the damping structure under the earthquake action The equivalent damping ratio of energy consumption. Considering that the damper not only provides additional damping to the structural system but also provides additional stiffness, the equivalent stiffness of the shock-absorbing structure at target displacement is proposed to be proportional to the layer shear force to optimize the distribution of structural stiffness under the target displacement. In order to consider the influence of high-order modes, a method of correcting the design results based on the first-order modes is proposed. Using the layer shear model, 28 kinds of structures with different elastic stiffness, 2-times stiffness ratio and yield angle distribution are designed to reduce the vibration. A total of 336 kinds of elastic-plastic time-history of non-controlled structure and control structure are implemented analysis. The results show that the controllable layer displacement angle is well controlled within the target displacement angle, and the displacement angles of the layers are evenly distributed, and the expected deformation target is basically reached. At the same time, the control structure of the residual deformation angle is smaller, the degree of dispersion is also smaller. The proposed method can be effectively applied to the structure of the damping control design.